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Recent Alum Sludge Dewatering at Water Treatment Plants


Noosa WTP, Qld
Alum sludge Dewatering
Process
Plant Capacity: 60ML/day

Plant Commissioned: 2006

Client: General Water Australia

Source of Water: Mix of river and dam water

Chemical Requirements Thickener 1.5kg/tonne DS Centrifuge 4kg/tonne DS

Cake Solids Max:18% Av: 14-15%

2 duty/standby backwash recovery tanks collect backwash water from the dual media filters and BAC filters. Following a settling time the supernatant from the backwash recovery tank is gravity fed to a creek. The settled sludge from the backwash recovery tank (0.5%DS) is dosed with polymer and pumped to a thickener.

The thickener supernatant is returned to the backwash recovery tank. The thickener sludge (2.5%DS) is gravity transferred to a sludge holding tank where it is kept continually mixed

This sludge is dosed with polymer and pumped at a constant rate to 2 duty/standby centrifuges. The centrifuge centrate is returned to the backwash recovery tank. The sludge cake (14%DS) is conveyed to a sludge bin via a Spirac conveyor for disposal off site.




Ampara WTP,
Eastern Coastal Sri Lanka
Alum sludge Dewatering
Process
Plant Capacity: 60ML/day

Plant Commissioned: 2007

Client: Outokumpu

Source of Water: Dam Water

Chemical Requirements Thickener 1kg/tonne DS Centrifuge 4.5kg/tonne DS

Cake Solids Av: 14-15%

The raw water contains massive amounts of algae and is dosed with PAC before entering 10 DAFF trains.

Backwash water is collected in a backwash holding tank where it is kept constantly mixed and blended with the DAF float. This mixture is dosed with polymer and pumped to a thickener.

The thickener supernatant gravity feeds back to the raw water dam. The thickened sludge (2.5%DS) is transferred to a sludge holding tank where it is kept continually mixed.

This sludge is then pumped at a controlled rate to 2 duty/standby centrifuges. The centrifuge centrate is pumped back to the backwash holding tank. The solids cake is conveyed via a spirac conveyor to a bin to be trucked off site.


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